US4352133A - Magnetic disc memory - Google Patents

Magnetic disc memory Download PDF

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Publication number
US4352133A
US4352133A US06/236,970 US23697081A US4352133A US 4352133 A US4352133 A US 4352133A US 23697081 A US23697081 A US 23697081A US 4352133 A US4352133 A US 4352133A
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US
United States
Prior art keywords
magnetic
swivel arms
disc
storage discs
swivel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/236,970
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English (en)
Inventor
Horst Hager
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nixdorf Computer AG
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Nixdorf Computer AG
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Filing date
Publication date
Application filed by Nixdorf Computer AG filed Critical Nixdorf Computer AG
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Publication of US4352133A publication Critical patent/US4352133A/en
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/021—Containers; Storing means both adapted to cooperate with the recording or reproducing means comprising means for reducing influence of physical parameters, e.g. temperature change, moisture
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks

Definitions

  • Known magnetic disc memories comprise a plurality of circular magnetic storage discs which are arranged fixed against rotation and axially spaced from one another on a shaft directed at right angles to the disc plane, a drive mechanism to drive the shaft, a plurality of swivel arms to hold the magnetic heads serving to record and play back information onto the or from the magnetic storage discs, the swivel arms being mounted pivotably for a common swivel movement about a pivot directed substantially parallel to the shaft of the magnetic storage discs, so that a swivel arm can be pivoted at least partly into each gap between any two magnetic storage discs adjacent one another, and a drive mechanism to swing the swivel arms, the magnetic storage discs and the swivel arms together with the magnetic heads being enclosed in a housing.
  • the quality of such a magnetic disc memory is determined substantially by four criteria: by the reliability with which information can be stored and reproduced, by the mechanical dimensions, by the power input and by the access time, that is, the average period required to locate a certain storage place and to store or read information at this storage place.
  • the reliability of storage or reproduction is determined by, among other things, the storage density, that is, the number of storage places per unit of area of the magnetic storage discs. For a given storage capacity it is not permissible, therefore, to fall short of certain minimum dimensions of the magnetic storage discs.
  • the access time is substantially determined by the speed at which the magnetic heads can be adjusted to a certain storage place of the magnetic storage discs. So that high setting speeds can be achieved, on the one hand, the moving parts (swivel arms, magnetic heads) must be made stable, so that they withstand the high acceleration forces and are not excited to the point of their natural mechanical resonance, and, on the other hand, correspondingly strong drive mechanisms are required, so that the swivel arms can be moved with the correspondingly high acceleration. Because of this, the volume and weight of known magnetic disc memories are relatively large, although a reduction in size of the magnetic storage discs, while retaining the same storage capacity, would be possible owing to improved coating of the magnetic storage discs and the higher storage density obtained thereby.
  • the problem of the invention is to design a magnetic disc memory of the above-mentioned type, so that its dimensions can be reduced and a lessening of the power input and a shortening of the access time are achieved at the same time.
  • the swivel arms pivotable between any two adjacent magnetic storage discs have at least in the region penetrating between the magnetic storage discs a profile which has low air resistance in the direction of flow of air dragged around by the rotating discs in use.
  • the swivel arms which on known magnetic disc memories are made as angular discs consisting of solid material have for the air layer rotating in the gap between two magnetic discs a considerable air resistance which manifests itself in an elevated power input of the drive mechanisms for the swivel arms and the disc stack.
  • the swivel arms are made in the form of a wing profile and have on the leading edge a substantially semicircular profile. It must be remembered when selecting the dimensions for the swivel arm that, on the one hand, the aerodynamic resistance is also determined by the ratio of thickness to length in the direction of flow of the body in the flow and, on the other hand, the dimensions must be selected so that the natural resonance of the swivel arms lies so high that natural vibration of the swivel arms is avoided during the sudden setting movements.
  • the swivel arms are designed as hollow bodies.
  • the resonant frequency of a hollow body of arbitrary wall thickness lies only immaterially below the resonant frequency of a similarly dimensioned solid body.
  • the mass and, consequently, the moment of inertia of a hollow body lies, however, considerably below comparable values of a solid body.
  • conventional swivel arms consisting of solid material have a moment of inertia higher by the factor 50 than that of the swivel arms according to the invention made as hollow bodies.
  • the drive mechanism for positioning the swivel arms can be made correspondingly weaker despite an elevated positioning speed. That means a lower power input and smaller dimensions of the drive mechanism.
  • Such swivel arms made as hollow bodies and, for example, tubular can be welded, for example, in a simple way from thin sheet steel.
  • the swivel arms are made of a compact fibre material. While having the same strength properties as steel, this compact fibre material has a specific gravity of only a quarter of the specific gravity of steel.
  • Reinforcements can optionally be arranged in the cavities of the swivel arms, in order further to increase the strength of the swivel arms without a substantial increase in the moment of inertia.
  • a reinforcement can consist, for example, of a thin-walled honeycomb structure between the topside and bottomside of the swivel arm in question or of a hard foam packing filling at least partly the cavity of the swivel arm in question.
  • the swivel arms are made wedge-shaped at their end remote from the pivot and terminate in a fin for fastening the magnetic heads.
  • This form of the swivel arms can easily be realised, especially when the swivel arms are designed as hollow bodies, by squeezing the swivel arms in the end region remote from the pivot.
  • the magnetic heads can then be fastened to this fastening fin via spring tongues running substantially perpendicular to the longitudinal direction of the swivel arms, so that, when the swivel arms are pivoted, the said magnetic heads move along a track running approximately radially in relation to the storage disc axis.
  • the drive mechanisms are formed by electric motors engaging directly on the shaft of the magnetic storage discs or the pivot of the swivel arms.
  • These electric motors can be formed, for example, by disc-rotor motors with an armature disc arranged fixed against rotation on the shaft or pivot.
  • the inner space of the housing is completely sealed off and is connected to the outside via an absolute filter only for the equalisation of pressure between the inside and the outside.
  • an electrostatic/magnetic filter is provided in the housing.
  • a part of the cylindrical inside wall of the housing is charged electrostatically in the case of this filter or is coated with an electret and the carrier material is magnetised either directly or indirectly.
  • the electrostatic lines of force departing from this filter attract electrostatically chargeable dust particles and the magnetic lines of force departing from the filter carrier attract magnetisable dust particles and retain them thereon.
  • This filter can be made very space-saving, requires no power for operation and causes no noises.
  • the filters used hitherto conventionally exclusively on disc memories are based on forced air circulation through a mechanical straight-through filter. The disadvantage of these filters resides in the fact that they constantly consume power owing to circulation of air and are altogether very bulky, since they not only consist of the actual straight-through filter, but the fan and an air duct from the fan to the filter also have to be accommodated.
  • the swivel arms can be secured during transport of the magnetic disc memory, they can be restrained in their extreme swivel position remote from the centre of the magnetic discs appropriately by operatively releasable locking means.
  • the swivel arms are therefore locked when they reach their outer extreme swivel position, for example, clamped by spring means, so that they are secured when the drive motor is switched off, but are released when swung by the drive motor in the direction of the centre of the magnetic discs.
  • FIG. 1 is a partly schematic plan view of a magnetic disc memory according to the invention
  • FIG. 2 is a partly schematic section along the line II--II of FIG. 1;
  • FIG. 3 is an enlarged plan view of a swivel arm during penetration between two magnetic storage discs shown only partly;
  • FIG. 4 is a view in the direction of the arrow A in FIG. 3;
  • FIG. 5 is a section along the line V--V in FIG. 3;
  • FIG. 6 is a section along the line VI--VI in FIG. 3 in the direction of flow.
  • the magnetic disc memory shown in FIGS. 1 and 2 comprises a squared housing designated generally by 10, with side walls 12, a false bottom 14 and a cover 16. This space surrounded by the side walls 12, the false bottom 14 and the cover 16 is sealed in a dust-proof manner.
  • FIGS. 1 and 2 On the left-hand side of FIGS. 1 and 2 can be seen a stack of magnetic storage discs 20, designated generally by 18.
  • the circular magnetic discs 20 are mounted on a cylindrical, pot-shape disc carrier 22 coaxially to the cylinder axis, the lowest magnetic storage disc of the disc stack resting on a flange 24 made on the pot edge of the disc carrier 22 and pointing radially outwards and the magnetic storage discs 20 stacked on top of one another being separated from one another by spacer rings 26 of equal axial length, so that a gap 28 is formed between any two magnetic storage discs 20.
  • the disc carrier 22 is mounted on a spindle 30, passing through its pot bottom, so that it engages over a tubular bearing box 32 which is arranged with its axis substantially perpendicular to the false bottom 14 and is made in one piece therewith.
  • the spindle 30 is mounted freely rotatably coaxially to the bearing box axis via bearings 34 and 36.
  • the disc carrier 22 is placed onto the upper end, provided with an external thread 38, of the spindle 30 and is connected fixed against rotation to the spindle 30 by a nut 40 screwed onto the external thread 38, a cup spring 42 being pressed simultaneously by the nut 40 with its cup edge against the topmost magnetic storage disc 20 and consequently clamping the magnetic storage discs 20 on the disc carrier 22.
  • the disc stack is turned by a disc-rotor motor 44 with an armature disc 46 arranged fixed against rotation on the lower end of the spindle 30 and with magnets 48 inserted in the false bottom 14 and mounted on a divided circle.
  • the spindle is therefore driven directly without the interposition of a gear or other torque-transmitting devices.
  • the cut-out in the false bottom 14 which receives the disc-rotor motor 44 is closed towards the bottom substantially by a cover plate 50 which rests against the underside of the false bottom 14 and, in the same way as a plate 51 supporting the magnets 48, forms the magnetic return circuit.
  • FIGS. 1 and 2 On the right-hand side in FIGS. 1 and 2 can be seen a plurality of swivel arms 52 which are arranged on a second spindle 54 parallel to the first spindle 30 and are fixed against rotation therewith.
  • the spindle 54 is mounted freely rotatably with its lower end in a shaft bearing 56 inserted in the false bottom 14 and with its upper end in a shaft bearing 58 which is, in turn, inserted in a retaining clip 60.
  • the swivel arms 52 are separated from one another by equally long spacer rings 62, so that the swivel arms 52 have the same axial spacing from one another as do the magnetic storage discs 20.
  • the swivel arms 52 are, however, offset axially in relation thereto, so that when the second spindle 54 rotates the swivel arms 52 can engage into the gaps 28 between the two magnetic storage discs adjacent one another, with the same spacing from each of the adjacent magnetic storage discs 20.
  • the topmost and bottommost swivel arms pivot at a corresponding spacing respectively above the topmost and below the bottommost magnetic storage discs 20 of the disc stack.
  • the magnetic heads 66 rest on the topside or bottomside of the magnetic storage discs 20 in question, as long as the magnetic storage discs 20 are at rest. However, the magnetic heads 66 are shaped so that when the magnetic storage discs 20 are rotated they are lifted from the disc surface by the rapid relative movement in relation to the air layer adhering to the magnetic storage discs and thus float in a balanced condition over the disc surface during normal operation.
  • the drive to turn the spindle 54 and, consequently, to swing the swivel arms 52 is again formed by a disc-rotor motor 68 which consists substantially of an armature disc 70 mounted fixed against rotation on the lower end of the spindle 54 and of a magnet 72 arranged on a divided circle in the false bottom 14.
  • the cut-out in the false bottom 14 which receives the disc-rotor motor 68 is closed at least partly towards the bottom by a cover plate 74 which rests against the underside of the false bottom 14 and, in the same way as a plate 73 supporting the magnets 72, forms the magnetic return circuit.
  • an electrostatic filter 76 which is made laminar and is curved coaxially to the first spindle 30 and which serves to trap the dust which remains after manufacture in the otherwise dust-proof housing 10 or which occurs during operation of the magnetic disc memory.
  • the coordinates of a storage place on the magnetic storage discs 20 are given by their radial spacing from the disc centre and by their angular position in relation to an angular zero.
  • the magnetic storage discs 20 turn continuously at a constant high speed.
  • the magnetic heads 66 must be adjusted to a certain radial track, which is effected by pivoting the swivel arms 52 about the axis of the spindle 54.
  • Information is recorded on or read off from the storage discs sequentially in synchronism with disc revolution and in relation to the angular zero.
  • the pivoting movement of the swivel arms 52 is controlled via a servo circuit which controls the motor 68.
  • the servo circuit receives the position information required by scanning an incremental rotary pick-up 77. However, instead of the track information transmitted via the rotary pick-up 77, a single track information item recorded on a disc surface can be read with a magnetic head 66 and used for positioning control.
  • the disc stack is turned at a very high speed.
  • the air layers lying between the magnetic storage discs 20 and adjoining the topside and bottomside of the disc stack are carried along, so that the swivel arms 52 swinging in between the magnetic storage discs 20 are exposed to an air flow of high speed.
  • the air resistance of these swivel arms is therefore of considerable importance.
  • This air resistance is very high on conventional swivel arms, which necessitates correspondingly strong pivot drives and a strong drive of the magnetic storage discs.
  • the swivel arms 52 according to the invention are designed so that they possess a profile which is streamlined, that is, has a low air resistance, as shown by FIGS. 3 to 6.
  • FIGS. 3 and 5 show that the swivel arm 52 is designed in its main section 78 as a plate-shaped, thin-walled hollow body, the gap between the top and bottom sides being filled merely in the region of the bearing bore 80 by a supporting part 82, marked by a broken line, which forms a holder for the bearing bore 80 and simultaneously serves as a balancing mass for the swivel arm 52.
  • the swivel arm 52 tapers in a wedge and terminates in a flat fin 84 lying in the plane of the swivel arm 52 (FIG. 6).
  • This fin 84 serves to fasten the spring tongues 64 acting as carriers of the magnetic heads 66, a spring tongue 64 being fastened on the topside and bottomside of each of these fins 84.
  • the wedge-shaped taper and the fin 84 can be made by squeezing the hollow swivel arm 52.
  • the edge 86 of the swivel arm 52 near the centre of the magnetic storage discs 20 is attacked in the direction of the arrow C by the air layer carried along with the magnetic storage discs 20.
  • This edge 86 is therefore provided with a semicircular profile (FIG. 5).
  • the design according to the invention of the swivel arms as hollow bodies permits a lighter construction of the swivel arms 52, that is, a lessening of their moment of inertia.
  • the amount of inertia of the positioning system is reduced to approximately 1/50 of the hitherto conventional value.
  • the drive power can be reduced to 1/50 of the hitherto conventional value with the same positioning speed or the positioning speed can be increased with the same drive power by the square root of the factor of the reduction in the amount of inertia.
  • An intermediate value can, of course, also be selected.
  • the total weight of a comparable magnetic disc memory was hitherto approximately 80 kg, the total weight can be reduced to approximately 10 kg in the case of a magnetic disc memory according to the invention.
  • a volume of a magnetic disc memory of hitherto approximately 100 to 200 liters contrasts with a volume of approximately 15 liters in the case of the magnetic disc memory according to the invention and instead of a power input of approximately 0.5 kilowatts hitherto a power of only approximately 50 watts is now required.
  • the most substantial advantage of the magnetic disc memory according to the invention resides in the fact its access time is lower by approximately the factor 3 to 4 than in the case of hitherto known magnetic disc memories of the same capacity.
  • the magnetic disc memory according to the invention can be manufactured in a simpler and cheaper way.

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  • Moving Of Heads (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
US06/236,970 1977-07-18 1981-02-23 Magnetic disc memory Expired - Fee Related US4352133A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2732432 1977-07-18
DE2732432A DE2732432C2 (de) 1977-07-18 1977-07-18 Schwenkarm für einen Magnetplattenspeicher

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US05922735 Continuation 1978-07-07

Publications (1)

Publication Number Publication Date
US4352133A true US4352133A (en) 1982-09-28

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Application Number Title Priority Date Filing Date
US06/236,970 Expired - Fee Related US4352133A (en) 1977-07-18 1981-02-23 Magnetic disc memory

Country Status (7)

Country Link
US (1) US4352133A (fr)
JP (1) JPS5923031B2 (fr)
DE (1) DE2732432C2 (fr)
FR (1) FR2398362A1 (fr)
GB (1) GB1601299A (fr)
IT (1) IT1097501B (fr)
NL (1) NL179243C (fr)

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US4712146A (en) * 1985-06-04 1987-12-08 Plus Development Corporation Thin and compact micro-Winchester head and disk assembly
US4805055A (en) * 1986-11-24 1989-02-14 Maxtor Winchester disc drive actuator structure
US4873596A (en) * 1986-10-27 1989-10-10 Matsushita Electric Industrial Co., Ltd. Magnetic disk drive apparatus
DE4120064A1 (de) * 1990-06-19 1992-01-09 Hitachi Ltd Magnetplattengeraet unter verwendung eines rotationsstellgliedes
US5119254A (en) * 1980-09-24 1992-06-02 Quantum Corporation Data transducer position control system for rotating disk data storage equipment
US5126904A (en) * 1989-12-07 1992-06-30 Yutaka Sakurai Magnetic head supporting structure with thick and thin portions for an information recording apparatus
US5424887A (en) * 1980-03-05 1995-06-13 Papst Licensing Gmbh Disk storage drive
USH1573H (en) * 1993-07-01 1996-08-06 Budde; Richard A. Reduced mass/inertia suspension
USRE35792E (en) * 1981-09-07 1998-05-12 Papst Licensing, Gmbh Disk storage drive
US5774302A (en) * 1981-09-07 1998-06-30 Papst Licensing, Gmbh Spin drive motor for a disk storage device
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US5801905A (en) * 1996-11-15 1998-09-01 International Business Machines Corporation Actuator arm with cutouts and means for filling or blocking the cutouts
US5801900A (en) * 1980-05-10 1998-09-01 Papst Licensing Gmbh Disk storage device, with hub and drive motor rotor features
USRE36016E (en) * 1984-11-29 1998-12-29 Papst Licensing, Gmbh Disc storage device having an integrated driving system
US5877916A (en) * 1997-04-01 1999-03-02 Papst; Georg F. Disk storage device with stator-rotor positioning providing improved spindle torque and acceleration
US6005746A (en) * 1997-04-01 1999-12-21 Papst Licensing Gmbh & Co. Kg Disk storage device with improved spindle torque and acceleration
USRE37058E1 (en) 1980-05-10 2001-02-20 Papst Licensing Gmbh & Co. Kg Disk storage device having contamination seals
US6271988B1 (en) 1997-01-04 2001-08-07 Papst Licensing Gmbh & Co. Kg Disk storage device with improved spindle torque and acceleration
US6344946B1 (en) 1997-04-01 2002-02-05 Papst Licensing Gmbh Disk storage device with improved spindle torque and acceleration
US6366432B1 (en) * 1999-10-28 2002-04-02 Seagate Technology Llc Actuator arm with tapered trailing edge and recessed head conductor
US6442002B1 (en) 2000-02-11 2002-08-27 International Business Machines Corporation Stackable, interlocking mounting supports for data storage actuator arm
US6473271B1 (en) * 1999-06-11 2002-10-29 Seagate Technology Llc Aerodynamically streamlined actuator arm for disc drives
US20030043511A1 (en) * 2001-08-30 2003-03-06 International Business Machines Corporation Actuator arm design for reducing power consumption in a disk drive data storage device
US6597540B2 (en) * 1999-10-15 2003-07-22 Fujitsu Limited Head arm having through hole for making head arm lightweight, head moving mechanism and disk unit having the head arm
USRE38601E1 (en) 1980-05-10 2004-09-28 Papst Licensing, GmbH & Co. KG Disk storage device having a radial magnetic yoke feature
USRE38662E1 (en) 1980-05-10 2004-11-30 Papst Licensing Gmbh & Co. Kg Disk storage device having a sealed bearing tube
USRE38673E1 (en) 1980-05-10 2004-12-21 Papst Licensing Gmbh & Co. Kg Disk storage device having a hub sealing member feature
USRE38772E1 (en) 1981-03-18 2005-08-09 Papst Licensing Gmbh & Co. Kg Disk storage device having an undercut hub member
US20050185327A1 (en) * 2004-02-23 2005-08-25 Voights Ronald L. Air stream filtration system
US20050280947A1 (en) * 2004-06-22 2005-12-22 Yaling Fan Windage stripper for an actuator and rotating disc
US20070188930A1 (en) * 2006-02-16 2007-08-16 Sae Magnetics (H.K.) Ltd. Symmetric voice coil motor design, assembly methods of constructing same, and hard disk micro drive storage systems including same

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JPS5830968U (ja) * 1981-08-20 1983-02-28 パイオニア株式会社 回動型アクチユエ−タ
JPS58150169A (ja) * 1982-03-01 1983-09-06 Seiko Epson Corp 磁気デイスク装置
JPS5979470A (ja) * 1982-10-29 1984-05-08 Toshiba Corp 磁気デイスク装置のキヤリツジロツク機構
JPS6031763U (ja) * 1983-08-04 1985-03-04 株式会社三協精機製作所 デイスク駆動用モ−タ
DE3337845A1 (de) * 1983-10-18 1985-04-25 Nixdorf Computer Ag, 4790 Paderborn Festplattenlaufwerk
JPS60136943A (ja) * 1983-12-26 1985-07-20 Hitachi Ltd 回転デイスク装置
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Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5424887A (en) * 1980-03-05 1995-06-13 Papst Licensing Gmbh Disk storage drive
US5777822A (en) * 1980-03-05 1998-07-07 Papst Licensing Gmbh Disk storage drive
US5729403A (en) * 1980-03-05 1998-03-17 Papst Licensing Gmbh Disk storage drive
US5708539A (en) * 1980-03-05 1998-01-13 Papst Licensing Gmbh & Co. Kg Disk storage drive
US5946161A (en) * 1980-03-05 1999-08-31 Papst Licensing Gmbh Disk storage device having a labyrinth seal
USRE38662E1 (en) 1980-05-10 2004-11-30 Papst Licensing Gmbh & Co. Kg Disk storage device having a sealed bearing tube
USRE37058E1 (en) 1980-05-10 2001-02-20 Papst Licensing Gmbh & Co. Kg Disk storage device having contamination seals
USRE38673E1 (en) 1980-05-10 2004-12-21 Papst Licensing Gmbh & Co. Kg Disk storage device having a hub sealing member feature
US5801900A (en) * 1980-05-10 1998-09-01 Papst Licensing Gmbh Disk storage device, with hub and drive motor rotor features
USRE38601E1 (en) 1980-05-10 2004-09-28 Papst Licensing, GmbH & Co. KG Disk storage device having a radial magnetic yoke feature
USRE38179E1 (en) 1980-05-10 2003-07-08 Papst Licensing Gmbh & Co. Kg Disk storage device having a three-phase brushless DC underhub configured spindle motor
USRE38178E1 (en) 1980-05-10 2003-07-08 Papst Licensing Gmbh & Co. Kg Disk storage device having an underhub spindle motor
US5119254A (en) * 1980-09-24 1992-06-02 Quantum Corporation Data transducer position control system for rotating disk data storage equipment
USRE38772E1 (en) 1981-03-18 2005-08-09 Papst Licensing Gmbh & Co. Kg Disk storage device having an undercut hub member
US5774302A (en) * 1981-09-07 1998-06-30 Papst Licensing, Gmbh Spin drive motor for a disk storage device
USRE35792E (en) * 1981-09-07 1998-05-12 Papst Licensing, Gmbh Disk storage drive
USRE36016E (en) * 1984-11-29 1998-12-29 Papst Licensing, Gmbh Disc storage device having an integrated driving system
US4712146A (en) * 1985-06-04 1987-12-08 Plus Development Corporation Thin and compact micro-Winchester head and disk assembly
US4873596A (en) * 1986-10-27 1989-10-10 Matsushita Electric Industrial Co., Ltd. Magnetic disk drive apparatus
US4805055A (en) * 1986-11-24 1989-02-14 Maxtor Winchester disc drive actuator structure
US5126904A (en) * 1989-12-07 1992-06-30 Yutaka Sakurai Magnetic head supporting structure with thick and thin portions for an information recording apparatus
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Also Published As

Publication number Publication date
JPS5923031B2 (ja) 1984-05-30
IT1097501B (it) 1985-08-31
JPS5425713A (en) 1979-02-26
NL7806786A (nl) 1979-01-22
IT7825471A0 (it) 1978-07-07
NL179243B (nl) 1986-03-03
FR2398362B1 (fr) 1983-07-22
GB1601299A (en) 1981-10-28
DE2732432C2 (de) 1988-05-05
NL179243C (nl) 1986-08-01
FR2398362A1 (fr) 1979-02-16
DE2732432A1 (de) 1979-02-01

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